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-- { dg-do compile }

-- { dg-options "-gnata -O2 -fno-inline" }

with Ada.Unchecked_Conversion;

package body Loop_Optimization2 is

   function To_Addr_Ptr is

      new Ada.Unchecked_Conversion (System.Address, Addr_Ptr);

   function To_Address is

     new Ada.Unchecked_Conversion (Tag, System.Address);

   function To_Type_Specific_Data_Ptr is

     new Ada.Unchecked_Conversion (System.Address, Type_Specific_Data_Ptr);

   function Interface_Ancestor_Tags (T : Tag) return Tag_Array is

      TSD_Ptr : constant Addr_Ptr := To_Addr_Ptr (To_Address (T));

      TSD : constant Type_Specific_Data_Ptr :=

                      To_Type_Specific_Data_Ptr (TSD_Ptr.all);

      Iface_Table : constant Interface_Data_Ptr := TSD.Interfaces_Table;

   begin

      if Iface_Table = null then

         declare

            Table : Tag_Array (1 .. 0);

         begin

            return Table;

         end;

      else

         declare

            Table : Tag_Array (1 .. Iface_Table.Nb_Ifaces);

         begin

            for J in 1 .. Iface_Table.Nb_Ifaces loop

               Table (J) := Iface_Table.Ifaces_Table (J).Iface_Tag;

            end loop;

            return Table;

         end;

      end if;

   end Interface_Ancestor_Tags;

end Loop_Optimization2;